minor update for RHEL-7 rpm docs

[Vince Skahan]

Tom - in the -users group we've been going back and forth with a user having some growing pains getting the rpm to install on CentOS7.   I think a minor tweak to the redhat.htm docs might help.

--- suggested addition to the RH7 section ---

For RHEL 7 based systems,  also enable the EPEL repo and install pyserial, pyusb, and (optionally) python2-pip rpms from there.

They are not bundled with CentOS-7 in the os's default repositories.  They're extras.

• sudo yum install epel-release
  
• sudo yum install -y pyserial pyusb
• sudo yum install -y python2-pip

[Tom Keffer]

Like this? I don't quite get the asymmetry between RHEL 7 and 8. Don't they both require EPEL?

Install pre-requisites

For Redhat 8, you will be using Python 3. Here are the pre-requisites:

sudo yum install epel-release
sudo yum install python3-cheetah

For Redhat 7, you will be using Python 2. You will need to enable the EPEL repository, then install some pre-requisites. They are not bundled in the default repositories.

sudo yum install epel-release
sudo yum install -y pyserial pyusb
sudo yum install -y python2-pip

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[Vince Skahan]

Actually yes, but for different things.  Redhat 7 needs serial/usb and (optionally) pip from EPEL.  Redhat 8 needs cheetah from EPEL.   Basically they switched what was in their core repos vs. EPEL for those rpms when they did the Redhat 8 major update.

I guess I'd suggest a tiny tweak to what you have there...

 * the 'you will need' wording in your Redhat 7 section is nice and clear.  Suggest using it in the Redhat 8 section too.

 * pip in the Redhat 7 section is of course optional for weewx, if we want to split hairs there

I did verify the Redhat 8 rpm is ok with the instructions as written plus your python3-cheetah steps you added above, so the rpm itself is good as-is.

Thanks....